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Old 07-28-2012, 09:57 AM   #1
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No air

So I have to use my dad's 1999 jeep wrangler because I just totaled my car this week.

Well there is no air coming from the vents. No AC, no heat, no fan air. Nothing. Not on any speed. When I drive and am over about 40 mph air flows into the car and it's ice cold. But it's not forced air. Also I know the compressor is kicking on because it still drips water and the air flow is ice cold when it comes through.

My first thought was blower motor, replaced that, nothing. Next I thought I would try a new resistor because even though it didn't work on high, I had the same thing happen on my car and it fixed it. But the resistor didn't fix it. Then I replaced the blower switch and that didn't fix anything.

So all that is left is the wiring correct?? or is there anything else I can try to replace before I attack the wiring?

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Old 07-28-2012, 10:49 AM   #2
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You didn't say but I assume you checked the fuse?

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Old 07-28-2012, 10:54 AM   #3
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yes i have checked the fuses. I checked most of the fuses under the hood as well but I don't know what fuses are for what.. I checked the owner's manual but i couldn't find any diagram. Is there under the hood for the blower motor?
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Old 07-28-2012, 12:08 PM   #4
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You check the relay?
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Old 07-28-2012, 12:52 PM   #5
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Pull the doors and the top! Enjoy!
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Old 07-29-2012, 12:11 AM   #6
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Pull the doors and the top! Enjoy!
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Old 07-29-2012, 10:30 AM   #7
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i will probably be taking the top off, the only problem is it is 90-95 degrees here every day and when i have to go to work i have to wear a button up and pants. So that's not a possibility all the time.

where is the relay? by the resistor?
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Old 07-29-2012, 11:49 AM   #8
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Something to look for: The blower circuit finds it's way to ground through the mode switch. I had a burnt connection at the mode switch on my old SE that gave me the same symptoms.
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Old 07-29-2012, 02:27 PM   #9
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Check the electrical connection behind the computer on the firewall under the hood. It's a PITA to get to, but was the issue with mine.
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Old 07-29-2012, 03:29 PM   #10
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i will probably be taking the top off, the only problem is it is 90-95 degrees here every day and when i have to go to work i have to wear a button up and pants. So that's not a possibility all the time.

where is the relay? by the resistor?
Behind glove box. It should be pinned next to that green plug. Don't remember the colors, but you can jump the two thickest wires that are across from each other. If it kicks on you know your relay is bad.

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Old 07-31-2012, 06:38 PM   #11
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well i've replaced everything, blower motor, resistor, relay, blower switch. so now all that is left is the wiring.

compressor comes on so that is fine. So i need to check to make sure there is power to the blower switch, blower motor, and resistor..

what wires should have power?
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Old 07-31-2012, 07:28 PM   #12
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Pull your gauge cluster & check wires (to the right if holding the cluster in hand) on your vent settings. They have a tendency to melt & sometimes you can wiggle the connection to make contact. Mine has been jerry-rigged with a wire strap for two years now.
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Old 07-31-2012, 09:43 PM   #13
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the actual gauge cluster? how would that have vent wires coming to it? do you mean the air control panel? or the cluster with speed/RPMs?
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Old 07-31-2012, 09:53 PM   #14
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Sorry, when I say cluster (panel I reckon) I'm referring to the blower, cool/heat, & ac/vent selector. The ac/vent control has the wires that are prone to melting.
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Old 07-31-2012, 09:54 PM   #15
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I thought 1999 Jeep wrangler SE comes without A.C.
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Old 07-31-2012, 10:31 PM   #16
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ok gotcha. i mean i've checked all the end connections and nothing is melted or frayed at any connection. I don't know what else to do other than put in a manual switch where I can just turn the blower on and off right now. I don't want to try and rewire the whole vehicle right now hahah
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Old 07-31-2012, 10:47 PM   #17
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I checked most of the fuses under the hood as well but I don't know what fuses are for what
and i did end up checking all of them.. nothing
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Old 08-01-2012, 04:55 AM   #18
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It's fun chasing down the a/c gremlins. I'd run power to the blower & make sure it's good.
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Old 08-02-2012, 12:12 AM   #19
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yeah i now just have a toggle switch wired in so that i have some air.

my question is though.. why is the air flow so weak? i mean i understand that because it's on a toggle switch it's either on or off, but i feel barely any air coming out of the vents. But i can hear a large airflow coming from the blower..

the air changes which vent it comes through when i change it from floor to face to windshield, but the overall flow is very weak.

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